Sound recording apparatus



Sept. 26, 1939. GOLDMAN 2,174,226

SOUND RECORDING APPARATUS Filed Sept. 15, 1937 I as '26 27 it 20 5721 /2 a0 52 @1'9'] 62. 25 I 551%? 15 2 25 I [m I 7 I l HU 1 42 w i I I J 2 ls/poks H GOLD/WAN 1 N VENTOR. 10

ATTORNEY.

. I I Li -742 6:

UNITED STATES PATENT OFFICE som :1 MARATUS 3 stimate \e e (ere-m This invention relates generally to devices for a central circular cut-out ii for the turntable it securing disk records to sound recor or u mlmorte the overhead teed i m {or the bined sound recording and pie epparatue: in WW1 hly and the p y ck meth hut more specifically to meane for i r the niem. The ttehle it is provided with e. shaft 5 record their and a driving flange to the t it i hie it inc" throne e him" it secured to the cenioff the apparatus when used to record sound. tee and untiereide oi ttable it. the e eheit The main object or the invention reeiriee in the it were on ite upper one! u. pin it to t; provision or a yieldable and tive rec Ruth e rem diet it n a Mime flenee stuol mounted on the turntable d edep to Numeral it inrllcntee the usual ieit or ruhher peel winch to illlmttll'tiitll on the upper lace of n- W t tuhle it to turuieh a friction lace tor tooth. retire. the record it out the up eeee or the A further obiebt of the invention residue in turutehie it tor the election. Numeral it the provision oi oi rieldable securine eturl whoee indicati e-e e, heart eeeured to the rear of panel 5 function it auttically untreated when the it on which it eiv eo me n r e eir w w same sound recording epperatue in need an e r it the overlie teed r" lit r ver the pleyhaclr, the suppression of the iuncticn or the cutting heuil-eeeeruh.

said securing stud being we t m t. The overhead teed -e0hlr n eomprisee end ieully by the weight oi the sound rd M: hioctte l and W to which are eecureti he means mounted on the turntable by the operator on it oi mute ht upper rl lower amclne rode ti and we there were no securing stud eeel thereto. it, the hloch it helmet m l t h vo ember Aiurther obiectot the invention reeidw in the ill. t twirl ttr l t to eecui'eil between one provision oi a yleldable securine' .etuu mounted W he w th w l m W hflv tfl on the turntable which requires a, m or cutting heeti carriage M. The cutting head car 26 efiort to secure therewith regietretion oi the not i W i t l rt l'werdlr with an o it it flees in both theirewl'd one. end the amine tt with w ic he-11mm ed i oe etretee flange. vvhiie intermediately oi the heart cerriaee to in These ohiecte and other incident ends and en i or ill, the due Walls of which are threadadvantages oi the invention will hereinorter up to enuaue lead screw it. The opening t'l in 30 pear in the progress or the insure and s; provided with a latch mach, not shown on pointed out in the appended it the drawing, whereby the carriage M is held in Accompanying this specification is a wing and removable from threaded engagement with showing a. combined sound a i d playing the lead screw tt. Forwardly 0! cutting head apparatus having a cutting head of the electro carriaae it ie se ur d a c t e e t o e 3t magnetic type and also a playback or the elecably or the electromagnetic type having a stylus It} tromagnetic type to which a preferred i'onn oi 2t secured thereto by means 0! an adjustment the invention is especially applicable, the appli screw It. the acid cutting head preferably beine cation however not being solely confined to sound mounted on. a plate, the l r n belne shown recording and playing apparatus of the electroin the drawing, which pivots" on the i'orward end 40 magnetic type. In the said drawing, correspomlof the cutting head carriage 25. Knurled knobs m ing reference characters designate corresponding ll and It which facilitate the insertion, removal parts throughout the several views and wherein; and substitution of the lead screw 21 in tension Figure 1 is a top plan,vlew-ot a sound recofnihearings secured to end blocks?! and I! project ing and playing apparatus embodying a preferred from the ends oi the said tension bearings, the

455 form at the invention. latter being diagrammatically indicated by nuon;

Figure 2 is a tront elevational view of Figure 1. morals 33 and I4. Figure 3 is an enlarsed fragmentary view in The lead screw 24 is driven by means of a drivsection showing the construction of the yieldable in: flange 3 having an upwardly extending shalt securing stud as applied to a record disk and a 3i and a top cap member 81. A gear 38 is prodriving flange. vided on one end of the lead screw 24 and 1115- 50 A sound recording and playback apparatus is posed within and block 20, the said gear I! meshnow to be generally described to show the unique in: with a worm gear 38" mounted on the shaft application oi the invention thereto. 38, the said worm gear being enclosed in a hous- Numeral HI desiznatesaturntable whose motor in: II secured to end block II. The driving 66- drive system is not shown, while panel ll havinz iianle Ills provided with a plurality of oriilces to ll, Cl and ll for a p lrpoee hereinafter to be described It is well known in the art that in order to cut or engrave sound records, the recording disk and the driving flange operating the lead screw for the cuttinghead assembly must rotate with the turntable without slippage. Many means have been provided for accomplishing this result, such as the use of non-yieldable pins projecting upwardly from the turntable, the said pins engaging both the driving flange and the recording disk. An apparatus embodying such integrating means is not capable of being used as a playback for any standard engraved record in view of the fact that such a record may not have corresponding oriflces in its body. According to the present invention, a sensitive and yleldable plunger for a turntable is provided which, in addition to serving the function of integrating the record disk and the driving flange thereto, is capable of being automatically depressed by the weight of any playback record mounted on pin I. Moreover, the sensitive and yieldable plunger hereinafter to be described, may be made to automati cally engage one of the oriflces 3!, M and M of the driving flange and centrally offset oriflce ill of the record ll. With the use of the said plunger, the record disk may be placed upon pin ll of turntable II so that the orifice 50' registers with the yieldable plunger normally projecting above turntable ll. Likewise, driving flange 35 may be superposed on the record I. already mounted on the turntable so that the projecting portion of the plunger engages one of the orifices II, ill and 4|.

However, both the record I. and the driving flange 35 may be separately mounted on the turntable while the latter is in motion. This is accomplished by causing slippage between the record II and turntable ll until the plunger caused to be depressed by the weight of record I! registers with oriflce SI of record I. Similarly in order that one of the oriflces 3|, 40 and ll of driving flange 3| register with the plunger proiecting above oriflce ll while the turntable is in motion, slippage is caused between driving flange 8| and record ll until the plunger depressed by the weight of driving flange 3i registers with any one of the oriflces II, II and II.

The .yieldable plunger above set forth in its construction and mounting is made for great sensitivity to pressure and absence of side play. The turntable II is provided with a centrally offset cylindrical oriflce 48 in which a bearing sleeve 44 is secured. Bearing sleeve ll is provided with an upper flanged wall 4 which engages with the upper surface turntable II. The rubber or felt pad Ii is provided with a circular cut-out portion II, the diameter of which is substantially equal to the diameter of the upper flanged wall I. The bearing sleeve 44 is provided with a cylindrical bore having an upper portion 4: and a lower portion of smaller diameter 41, the junction of the two bore portions ll and 41 near the bottom of sleeve 0 aflording shoulders It. A shaft,

0 is provided having an upper portion in the form of a plunger member I, the diameter of the shaft ll being substantially equal to the diameter of bore portion 61 while the diameter of the plunger member ll is substantially equal to the diameter of bore 40. Thus, shaft ll is provided with its own bearing in the form of the inner walls of bore 41, while plunger member 8. is provided with its own bearing in the form of the inner walls of bore 46. A spring chamber is aflorded within bore ll between shoulders ll and the lower wall of plunger member 50, the said chamber housing an expansible helical coil spring II which normally causes the projection of plunger member 50 to penetrate the oriflce 50 of record It and one of the oriflces 38, 40 and ll of the driving flange 3i. Shaft 48 projects beyond the lower face of burr ll of the turntable and is there en-,

back of the electromagnetic type or any othertype, the said playback having a support 52 on which arms 53 and 54 are pivoted. The arm 54 has secured thereto the usual pick-up mechanism 55 having a thumb screw 56 to secure a needle 59 thereto. The playback assembly has the usual rest piece 51 and clamping member 58.

I wish it understood that minor changes and variations in the construction of the embodiment of the invention relating to integration of the several parts, duplication, location, material and combinations and subcombinations thereof may all be resorted to without departing fromthe spirit of the invention and without departing from the scope of the appended claims.

I claim:

1. In a recording apparatus for record disks having an eccentrically disposed orifice, the said recording apparatus also having an overhead feed assembly with and without a playback assembly, the combination of a turntable having a centrally disposed flxed pin, a driving flange engageable with said flxed pin and being provided with a plurality of circumferentiil oriflces, a spring operated and movable plunger carried by the turntable eccentrically of the center thereof, the spring normally forcing said plunger upwardly so that the latter projects a distance above the surface of the turntable with a force slightly less than that of the weight of a record carried by said turntable and less than the weight of the driving flange, the said plunger being adapted to register with the record disk oriflce and any one of the oriflces of the'driving flange.

2. In a recording apparatus havingan overheadfeed assembly the combination of a flat turntable carrying a record thereon, the said record having an eccentrically disposed opening therein, a driving flange having a flat undersurface and adapted to superpose the record on the turntable and be driven by the said turntable and having eccentrically disposed engaging means thereon, a spring operated and movable plunger carried by the turntable eccentrically of the center thereof, andnormally projecting above the upper surface of the turntable, the said plunger engaging with the engaging means of the driving flange and the opening of the record when placed in registering relationship, the weight of either the record or the said driving flange being suflicient to depress the plunger.

ISIDORE H. GOLDMAN. 

